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Based on recent studies on various plankton microfossils as planktonic foraminifera, calcareous nannoplankton, radiolarians and diatoms, an integrated scheme of biostratigraphy is constructed to be applicable to the middle and upper Miocene onshore sections in the central and northeast Honshu, Japan.Diatoms, diverse and abundant in the higher latitudes, have revealed usefullness for the Miocene biostratigraphy of northern Japan. On the other hand, the remaining three microfossils biostratigraphic zonations are principally established on the basis of warm water species. Because of their geographic limitation in distribution, these zonations are often difficult to be applied to the higher latitude sequences. Through cross-checking of seccessions of datum levels of diatom and other planktonic microfossils within several sections at the Sannohe, Ichinoseki, Sendai, Takasaki, Boso, Kakegawa areas and DSDP site 438A, a composite sequence of datum levels consisting of more than 20 paleontological events is established. It will provide the necessary framework for reconstruction of the Miocene paleoceanography and paleoenvironment of the northwestern Pacific margin.
石油技術協会の論文